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John Mullen — 1940 US Census Record
Linked across censuses1940 United States Federal Census · Contra-Costa-County, California
Our Model Tree links this John Mullen across the 1930 and 1940 US Censuses in Contra-Costa-County, California (XGBoost, ~Confirmed) — first a son (b.~1923), then head of a 12-person household.
Age 17
b. ~1923
Male
Son
Born: Ohio
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | Contra-Costa-County, California |
| Surname | Mullen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Antioch |
| 1935 Residence (County) | Contra Costa |
| Additional Details | |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
| Township / Ward | Antioch |
| Est. Birth Year | ~1923 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
12 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to John | Age | Birth yr |
|---|---|---|---|---|
| Sherry Vance | Daughter | — | 1 | ~1939 |
| Ann Vance | Daughter | — | 20 | ~1920 |
| Lily Mullen | Daughter | — | 16 | ~1924 |
| Pearl Vance | Daughter | — | 5 | ~1935 |
| John Mullen | Head | — | 44 | ~1896 |
| William Hughes | Other | — | 19 | ~1921 |
| Deverton Vance | Other | — | 27 | ~1913 |
| Benjamin Vance | Son | — | 12 | ~1928 |
| David Mullen | Son | — | 13 | ~1927 |
| John Mullen | Son | — | 17 | ~1923 |
| William Mullen | Son | — | 19 | ~1921 |
| Otta Mullen | Spouse | — | 43 | ~1897 |
Census Appearances
1930
Contra Costa, …
Son, age 7
Contra Costa, California · implied b. ~1923 — 8 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Mullen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 7 |
| Marital Status | Single |
| Birthplace | Ohio |
| Father's Birthplace | Kentucky |
| Mother's Birthplace | Ohio |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
1940
Contra-Costa-County, California
Son, age 17
Contra-Costa-County, California · implied b. ~1923 — 12 household members
| Surname | Mullen |
| Given Name | John |
| Relationship to Head | Son |
| Sex | M |
| Color / Race | White |
| Age | 17 |
| Marital Status | Single |
| Birthplace | Ohio |
| 1935 Residence (City) | Antioch |
| 1935 Residence (County) | Contra Costa |
| Highest Grade | H 1 |
| 1935 Residence | Same House |
| Birth State | Ohio |
| Birth Country | United States |
| Birthplace (normalized) | ohio |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links John Mullen across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
John Mullen
Son · 1940 · age 17 · b. ~1923 · California
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Sibling
Lily Mullen
Sibling · 1940 · age 16
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Ann Vance
Sibling · 1940 · age 20
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Sherry Vance
Sibling · 1940 · age 1
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Pearl Vance
Sibling · 1940 · age 5
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
David Mullen
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Benjamin Vance
Sibling · 1940 · age 12
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
William Mullen
Sibling · 1940 · age 19
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — Contra-Costa-County, California
Open full size
1940 US Federal Census — Contra-Costa-County, California
Page Contents
39 people indexed on this census page (nara:1940:m-t0627-00197-00134)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Mary Prevost | 36 | Wife | — | New Mexico |
| 42 | Alfred L. Prevost | 8 | Son | — | California |
| 43 | Sophie Prevost | 77 | Mother | — | France |
| 44 | Theresa Christin | 77 | Mother | — | France |
| 45 | David Simarro | 29 | Head | Wire Drawer | Spain |
| 46 | Isabell Simarro | 24 | Wife | — | California |
| 47 | David Jr. Simarro | 5 | Son | — | California |
| 48 | Nancy A. Simarro | 4 | Daughter | — | California |
| 49 | David Thompson | 31 | Head | Manager | Arkansas |
| 50 | Pauline Thompson | 31 | Wife | — | Arkansas |
| 51 | Willard Thompson | 10 | Son | — | California |
| 52 | Doris Thompson | 7 | Daughter | — | California |
| 53 | Leon Thompson | 5 | Son | — | California |
| 54 | Bernice Mcdaniel | 19 | Niece | — | Arkansas |
| 55 | Angeline Mcdaniel | 1 | Niece | — | California |
| 57 | Edgar Burgess | 33 | Head | Beater Man | Indiana |
| 58 | Evelyn Burgess | 32 | Wife | — | Indiana |
| 59 | Lulden Driskill | 37 | Head | Wire Drawer | Louisiana |
| 60 | Margaret Driskill | 36 | Wife | — | Pennsylvania |
| 61 | Santiago Ramirez | 41 | Head | Molder | New Mexico |
| 62 | Lottie S. Ramirez | 45 | Wife | — | California |
| 63 | Albert J. Maestretti | 20 | Head | Reper | California |
| 64 | Silvio Maestretti | 17 | Son | Stacker | California |
| 65 | Angelo Alles | 54 | Lodger | Manager | Italy |
| 66 | Cadence R. Johnson | 30 | Head | Service Man | Georgia |
| 67 | Edith Johnson | 26 | Wife | — | New Jersey |
| 68 | Russell Johnson | 2 | Son | — | West Virginia |
| 69 | John Mullen | 44 | Head | Heater | Kentucky |
| 70 | Otta Mullen | 43 | Wife | — | Ohio |
| 71 | William Mullen | 19 | Son | Maintenance | Ohio |
| 72 | John Mullen THIS PERSON | 17 | Son | — | Ohio |
| 73 | Lily Mullen | 16 | Daughter | — | Ohio |
| 74 | David Mullen | 13 | Son | — | Ohio |
| 75 | Deverton Jack Vance | 27 | Son-in-law | Catcher | California |
| 76 | Ann Vance | 20 | Daughter | — | Ohio |
| 77 | Pearl Vance | 5 | Daughter | — | California |
| 78 | Sherry Vance | 1 | Daughter | — | California |
| 79 | Benjamin Vance | 12 | Son | — | California |
| 80 | William Hughes | 19 | Nephew | Ccc Camp | Ohio |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)